/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.flink.runtime.state.ttl.mock;

import org.apache.flink.runtime.state.KeyedStateHandle;
import org.apache.flink.runtime.state.RestoreOperation;

import java.util.Collection;
import java.util.Collections;
import java.util.Map;

import static org.apache.flink.runtime.state.ttl.mock.MockKeyedStateBackend.copy;

/**
 * Implementation of mock restore operation.
 *
 * @param <K> The data type that the serializer serializes.
 */
public class MockRestoreOperation<K> implements RestoreOperation<Void> {
	private final Collection<KeyedStateHandle> state;
	private final Map<String, Map<K, Map<Object, Object>>> stateValues;

	public MockRestoreOperation(
		Collection<KeyedStateHandle> state,
		Map<String, Map<K, Map<Object, Object>>> stateValues) {
		this.state = state;
		this.stateValues = stateValues;
	}

	@Override
	public Void restore() {
		state.forEach(ksh -> stateValues.putAll(
			copy(((MockKeyedStateBackend.MockKeyedStateHandle<K>) ksh).snapshotStates,
				Collections.emptyMap())));
		return null;
	}
}
